Even if you think this, it still doesn't explain opposition to gay marriage. How does the choice of two consenting adults negatively impact you? Owning a gun is a choice, but just because I choose not to own one doesn't mean I think nobody should be allowed to buy guns. Smoking cigarettes is a choice, but just because I choose not to smoke doesn't mean I think cigarettes should be banned. Marriage is a choice, but even if I live my entire life as a bachelor, that doesn't mean I think marriage should be banned. So even if sexuality is a choice, why do you want an activity that doesn't affect you to be stopped just because you personally don't partake? Freedom doesn't just mean "freedom to live as I dictate you should."